140results about "X-ray tube structural circuit elements" patented technology

A method for operating a resonant converter having an inverter circuit, the inverter circuit having a plurality of switches, includes: switching each of the switches of the plurality of switches at an actuation frequency and with a phase angle offset relative to one another, such that a voltage of an output of the inverter circuit has a duty factor; and determining the actuation frequency and the duty factor for a prescribable operating point and with a prescribable phase reserve of the resonant converter. A resonant converter and an x-ray generator having a resonant converter are described.

An X-ray tube assembly includes an electron beam transport tube, a beam tube protection assembly, and a control module. The electron beam transport tube includes an opening configured for passage of an electron beam, and includes an inner surface bounding the opening along a length of the electron beam transport tube. The beam tube protection assembly includes a plurality of beam protection electrode segments disposed within the opening of the electron beam transport tube and configured to protect the inner surface of the electron beam transport tube from contact with the electron beam. The control module is configured to determine a direction of the electron beam responsive to information received from the beam tube protection assembly.

The invention discloses a laser modulation pulse X ray source used for space X ray communication. The laser modulation pulse X ray source includes an optical fiber interface, a cathode pedestal, a laser modulation cathode, a focusing electrode, a degassing device, a vacuum chamber housing and an anode metal target. The laser modulation cathode is composed of a negative cathode affinity photoelectric cathode, a micro-channel plate and a cathode housing. The basic principle is that laser is utilized for exciting the photoelectric cathode for generating photoelectrons; the photoelectrons are amplified through the micro-channel plate; the amplified electrons are subjected to co-effect of anode high voltage and the focusing electrode in the vacuum chamber and generate high speed highly-focused electron beams; the electron beams bombard the anode metal target and finally generate X rays. Since the input laser has characteristics of high repetition frequency and narrow pulse width, through effective signal conversion by the laser modulation pulse X ray source, the X rays also have characteristics of high repetition frequency and narrow pulse width and can perform restoration well on input laser pulse signals. Therefore, modulation on X ray pulse signals by laser pulse signals can be realized.

Provided are an X-ray generator capable of easily measuring a beam size of an electron beam on an electron target, and an adjustment method therefor. The X-ray generator includes an electron target including a first metal, a second metal different from the first metal, and a third metal different from the second metal, which are sequentially arranged side by side along a first direction in a continuous manner.

A device for producing x-rays includes: a housing that includes a folded high-voltage multiplier coupled to a filament transformer, the transformer coupled to an x-ray tube for producing the x-rays. A method of fabrication and an x-ray source are disclosed.

An X-ray source arrangement (10) for generating X-ray radiation (102), a method for operating the X-ray source arrangement (10), and an X-ray imaging apparatus (100) are provided. The X-ray source arrangement (10) comprises an X-ray tube (22), a converter arrangement (16) with an inverter (18) and a resonant converter (20) for providing a source voltage to the X-ray tube (22), a pre-controller (12), and a modulator (14). The pre-controller (12) is configured for determining a reference duty ratio (r, 26) of the resonant converter (20) as a continuous function of time based on a mathematical model of the resonant converter (20), and for providing a control signal (13) correlating with the reference duty ratio (r, 26) to the modulator (14). The modulator (14) is configured for determining a switching signal (15) based on the control signal (13), and for providing the switching signal (15) to the inverter (18) of the converter arrangement (16) for actuating the inverter (18).

A method of operating an acceleration system comprises injecting charged particles into an RF accelerator, providing RF power to the accelerator, and accelerating the injected charged particles. The accelerated charged particles may impact a target to generate radiation. The RF power is based, at least in part, on past performance of the system, to compensate, at least partially, for dose and / or energy instability. A controller may provide a compensated control voltage (“CCV”) to an electric power source based on the past performance, to provide compensated electric power to the RF source. A decreasing CCV, such as an exponentially decreasing CCV, may be provided to the electric power source during beam on time periods. The CCV to be provided may be increased, such as exponentially increased toward a maximum value, during beam off time periods. The controller may be configured by a compensation circuit and / or software. Systems are also described.

An X-ray window includes a primary and a secondary window element. In order to evaporate debris by ohmic heating, current flows through the secondary (upstream) window element. Meanwhile, electric charge originating from electron irradiation and / or depositing charged particles is to be drained off the secondary window element via a charge-drain layer. To prevent large debris particles from short-circuiting the secondary window element, the current for heating the window element flows through heating circuitry which is electrically insulated from the charge-drain layer.

Disclosed herein are an X-ray imaging apparatus and a control method therefor in which a region of a compressed breast is measured by a touch sensor and a collimator is controlled such that an X-ray emission region corresponds to the measured region of a compressed breast, whereby workflow for performing X-ray imaging may be reduced and subject pain due to breast compression may be alleviated. The X-ray imaging apparatus includes an X-ray source to generate X-rays and irradiate an object with the generated X-rays, a collimator to adjust an emission region of the X-rays generated from the X-ray source, an X-ray detector to detect X-rays having passed through the object to acquire X-ray data, a touch sensor disposed above the X-ray detector, a compression paddle to compress the object placed on the touch sensor, and a collimator control unit to calculate location and size of the compressed object based on an output value of the touch sensor and control the collimator based on calculation results.

Disclosed herein are a high-voltage generator (120) for an x-ray source, an x-ray gun, an electron beam apparatus, a rotary vacuum seal, a target assembly for an x-ray source, a rotary x-ray emission target (500), and an x-ray source. These various aspects may separately and / or together enable the construction of an x-ray source which can operate at energies of up to 500 kV and beyond, which is suitable for use in commercial and research x-ray applications such as computerised tomography. In particular, the high-voltage generator includes a shield electrode (123a, 123b) electrically connected intermediate of a first voltage multiplier (122a, 122b) and a second voltage multiplier (122b, 122c). The electron beam apparatus includes control photodetectors (202a, 202b - not shown) and photo emitters (201a, 202a) having a transparent conductive shield (203a and 203b, 203c - not shown) arranged therebetween. The rotary vacuum seal includes a pumpable chamber (302) at a position intermediate between high-pressure and low- pressure ends of a bore (301) for a rotating shaft (401). The rotary target assembly is configured such that when a torque between a bearing housing (403) and a vacuum housing exceeds a predetermined torque, the bearing housing rotates relative to the vacuum housing. The rotary x-ray emission target (500) has a plurality of target plates (560) supported on a hub, the plates being arranged on the hub to provide an annular target region about an axis rotation of the hub. The x- ray gun is provided with a shield electrode (123a) maintained at a potential difference relative to the x-ray target different to the electron beam emission cathode.

An HV connector for high power X-ray device consists of thermally conductive epoxy, cable terminal, faraday cup, spring-loaded contact, and lead lined housing. The thermally conductive epoxy includes fillers. The epoxy can also be loaded with gravels of similar materials. A Faraday cup is included in the center area to offer electric field relief. Spring-loaded contacts are included for the easiness of pin alignment and robustness of handling. An efficient thermal management solution is accomplished through proper selection of thermal conductivities of gasket and epoxy.

A transmission-type target includes a target layer and a transmissive substrate. The target layer is configured to generate X-rays in response to irradiation of electrons. The transmissive substrate supports the target layer and is configured to allow the X-rays generated in the target layer to pass therethrough. The transmissive substrate includes polycrystalline diamond in which grain boundaries extend in a substrate thickness direction and a substrate plane direction. The grain boundaries define an electrical potential of the target layer.

A high frequency X-ray generator includes an anode voltage generator, a cathode voltage generator and a X-ray tube. The anode voltage generator is configured to generate a first high voltage. The cathode voltage generator is configured to generate a second high voltage having a same waveform as the first high voltage. The second high voltage has a different phase by 180 degrees compared to the first high voltage. The X-ray tube is configured to generate a X-ray by the first high voltage and the second high voltage. The first high voltage is applied through an anode terminal. The second high voltage is applied through a cathode terminal.

This invention relates to a medical imaging method comprising: emitting a radiation beam from a radiation source of a rotating gantry, preferably of a rotating C-arm, on a volume of interest, varying collimation of said emitted radiation beam so as to change at least part-time a field of view of said emitted radiation beam so that there are at least a first part and a second part of said volume of interest such that, when said first part of said volume of interest is imaged, said second part of said volume of interest is shuttered, and when said second part of said volume of interest is imaged, said first part of said volume of interest is shuttered.

A magnetic field modulated multi-target X-ray source for spatial X-ray communication comprises a cathode structure, a focusing groove, an electron emission source, a glass shell, a Kovar alloy ring, afocusing electrode, a modulation electromagnetic device, a multi-target metal anode, and a transmission window. The cathode is connected with a negative high voltage, the electron emission source isdisposed in the focusing groove, the glass shell and the focusing electrode are in tight coupling by the Kovar alloy ring, the modulation electromagnetic device is disposed near the multi-target metalanode, the multi-target metal anode is grounded, and one side is facing a focus channel and the other side is plated on the transmission window layer. The magnetic field modulated multi-target X-raysource utilizes a fast-responding high-frequency modulation magnetic field, changes the electron motion trajectory to bombard the multi-target metal anode, excites characteristic X-rays of different energies, and uses characteristic X-rays of different energies as signal transmission carriers to solve the problem that the existing intensity modulation X-ray source technology is less in loading symbol signal and low in communication rate. The magnetic field modulated multi-target X-ray source has the advantages of multiple types of loading symbol signals and large communication rate.

The invention provides a high voltage generator which comprises an inverter which comprises a first bridge arm, a second bridge arm, and a third bridge arm between the first bridge arm and the second bridge arm. The first bridge arm and the second bridge arm comprise two switch devices, an anode inverter bridge can be formed by the first bridge arm and the third bridge arm, a cathode inverter bridge can be formed by the second bridge arm and the third bridge arm, the anode inverter bridge adjusts the anode voltage of the high voltage generator, and the cathode inverter bridge adjusts the cathode voltage of the high voltage generator. The high voltage generator also comprises a first control component which is used for controlling the switch device of the anode inverter bridge, the input end of the first control component is connected to the anode of the high voltage generator, and the output end is connected to the first bridge arm. The high voltage generator also comprises a second control component which is used for controlling the switch device of the cathode inverter bridge, the input end of the second control component is connected to the cathode of the high voltage generator, and the output end is connected to the second bridge arm. The cathode and anode of the high voltage generator are controlled individually, and the adaption ability to an unbalanced load is improved. In addition, the invention provides an X ray generation device and a control method thereof.

Provided is an X-ray generating apparatus, which includes: an X-ray generating tube configured to emit X-rays through a first window; an outer case configured to contain the X-ray generating tube and provided with a second window transmitting the X-rays at a position facing the first window; an insulating fluid with which an unoccupied space of the outer case is filled; an insulating member located between the first window and the second window and provided with an opening in an irradiation area of the X-ray through the first window; and an insulating third window removably fit into the opening of the insulating member, wherein a linear expansion coefficient of the third window is greater than a linear expansion coefficient of the insulating member, and the third window and the first window face each other via a gap through which the insulating fluid is flowable.

The invention discloses an integrated flying spot X-ray machine which comprises a radiation source generator (40) for generating an X-ray; a rotation collimator device (60) on which at least one small through hole are disposed and which can rotate around the radiation source generator (40); a no-frame torque motor (80) driving the rotation collimator device (60) to rotate around the radiation source generator (40); and a cooling device (20) for cooling the radiation source generator (40), wherein the radiation source generator (40), the rotation collimator device (60), the no-frame torque motor (80) and the cooling device (20) are equipped on integrated mounting frames (10,11). Compared with the prior-art, the integrated flying spot X-ray machine provided by the invention has a simple and compact structure and is a key core component for human body security check and medical fields.

The present approach relates to generating one or both of a failure prediction indication for an X-ray tube or a remaining useful life estimate for the X-ray tube. In one implementation, a trained static tube model is used in estimating health (e.g., thickness) of the electron emitter of the X-ray tube, which in turn may be used in predicting remaining useful life of an electron emitter of the X-ray tube.

A flat emitter for uses within an x-ray tube is formed of an electron emissive material that includes one or more stress compensation features capable of reducing the total stress in the flat emitter due to thermal expansion and / or centrifugal acceleration force. The features of the emitter for reducing the total stress in the flat emitter are formed directly on the emitter, are formed on the support structure for the emitter and connected to the emitter, or a combination thereof.

A motion correction system and method for motion correction for an x-ray tube is presented. One embodiment of the motion correction system includes a sensing unit coupled to an x-ray tube to determine a distance with which an impingement location of an electron beam generated by the x-ray tube deviates from a determined location due to motion of the x-ray tube. The motion correction system further includes a control unit coupled to the sensing unit to generate a control signal corresponding to the distance with which the impingement location of the electron beam deviates. Also, the motion correction system includes a deflection unit coupled to the control unit to steer the electron beam to the determined location based on the generated control signal.

An X-ray generator uses a high electrical field generated when a hemimorphic crystal is heated or cooled. The crystal may be lithium niobate polarized in one direction. An X-ray target is placed inside a housing inside which a vacuum is maintained. A tungsten line containing thorium is placed between the crystal and the target. When the crystal is heated or cooled by a Pelletier element, an intense electrical field is generated around the crystal. Thermoelectrons released from the tungsten line accelerate as a result of the electrical field and collide with the X-ray target. The X-rays released at this time radiate through a beryllium window exteriorly of the housing. Intense X-rays are generated without using large scale equipment, such as a high voltage power source.

The high voltage tube tank of x-ray system is embodied by miniaturizing the portable x-ray system for better mobility and portability. The high voltage tube tank of portable x-ray system comprising of an xray tube for generating x-rays, a high voltage transformer for generating high voltage, a high voltage rectification circuit for transforming and boosting AC voltage to DC voltage, and a housing for storing the apparatuses thereof, is configured in such a way that the high voltage rectification circuit is comprised of multiple high voltage capacitors linearly aligned on both sides of the circuit board and the high voltage diode built between the confronting high voltage capacitors, wherein the x-ray tube is placed between the high voltage capacitors thereof.

An imaging tube (30) includes multiple high voltage elements (64). A voltage-clamping device (70) is coupled between the high voltage elements (64) and prevents the occurrence of overvoltage transients in the minor insulation of an imaging tube (30).

The invention provides an arc-shaped multi-focus fixed anode gate controlled ray source which comprises an arc-shaped ray source shell, a ray tube bracket, a plurality of fixed anode reflected ray tubes and a plurality of gate controlled switches; the fixed anode reflected ray tubes are fixed on the arc-shaped ray source shell through the ray tube bracket; focuses of the fixed anode reflected raytubes are distributed on a same distribution circle; and the gate controlled switches are correspondingly connected with the fixed anode reflected ray tubes. The arc-shaped multi-focus fixed anode gate controlled ray source provided by the invention has the benefits that by splicing a plurality of arc-shaped multi-focus fixed anode gate controlled ray sources into a global ring structure, the focuses of all the fixed anode reflected ray tubes in the multi-focus fixed anode gate controlled ray sources can be distributed on the same distribution circle; and the arc-shaped multi-focus fixed anodegate controlled ray source is simple in structure and lower in cost and can generate rays with enough strength, and a sufficient number of focuses is distributed in the peripheral direction.